Equalizer valve assembly

Details Equalizer valve assembly Equalizer valve assembly

2008-01-29

2008-01-29

Dang, Hoang (Department: 3672)

Wells

Processes

Cementing, plugging or consolidating

C166S177400, C166S202000, C166S324000

Reexamination Certificate

active

07322413

ABSTRACT:
A method for controlling a fluid pressure applied to a cementing plug comprises disposing the cementing plug within a casing string to define a trapped volume of fluid within the casing string, isolating a portion of the trapped volume of fluid adjacent the cementing plug to define an isolated volume of fluid, and relieving the fluid pressure within the isolated volume of fluid at a first rate sufficient to prevent damage to or inadvertent release of the cementing plug. An apparatus for relieving fluid pressure within a casing string being run into a well bore comprises at least one equalizer valve connected to a work string extending into the casing string, and a sealing device disposed above the equalizer valve to seal an annular space formed between the work string and the casing string.

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